// Copyright 2022 FishGoddess. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package runtime

import (
	"os"
	"runtime"
)

var (
	pid = os.Getpid() // The pid of current process.
)

// PID returns the pid of current process.
func PID() int {
	return pid
}

// Caller returns the caller information of depth.
func Caller(depth int) (file string, line int, function string) {
	var pc uintptr
	var ok bool

	pc, file, line, ok = runtime.Caller(depth)
	if !ok {
		return "unknown", -1, "unknown"
	}

	f := runtime.FuncForPC(pc)
	if f != nil {
		function = f.Name()
	}

	return file, line, function
}
